The "there is" vs. "there are" discussion has been had on here before, but briefly, "There is" is idiomatic in most cases. An exception is when a plural number nouns immediately follows - or a phrase that indicates plural, like "plenty of."
Parking isn't counted - If there are places to park, there is parking. (There can be limited parking, plenty of parking, paid pa
That's right. Parking is singular because it refers to an amount, not a number. If you were to say "parking spaces" you would use the plural because spaces are countable. Fish and horses can be counted, therefore, "plenty" indicates the plural. When referring to parking, you are talking about an amount, not a number.
Then Is it safe to say that any noun which possesses the right quality to be used in such an adjectival form can be used without having any article attached to it?
«Then Is it safe to say that any noun which possesses the right quality to be used in such an adjectival form can be used without having any article attached to it?»
I wouldn't say that. The word «human» can be both a noun or adjective, while the word «anglel» is only a noun, as I know.